Thanks for the reply, Peter. I'm using FileZilla to get into the portal directory, where all the PDFs reside and where DMX is/should be pulling them from. I've confirmed that the physical files are updated as you can simply tell by downloading them through FTP or accessing them through the replative path -
http://example.com/Portals/0/documents/pdf.pdf . Also, it's a duplication issue as I've scanned the whole httpdocs directory for any other PDFs and no duplicates were found. You'd assume that if you simply update the file, the next time you try to access it through DMX, you'd be shown the updated version. Any help is highly appreciated.